The problem was in a test case for Bug33507:
  - when the number of active connections reaches the limit,
    the server accepts only root connections. That's achieved by
    accepting a connection, negotiating with the client and
    checking user credentials. If it is not SUPER, the connection
    is dropped.
  - when the server accepts connection, it increases the counter;
  - when the server drops connection, it decreases the counter;
  - the race was in between of decreasing the counter and accepting
    new connection:
    - max_user_connections = 2;
    - 2 oridinary user connections accepted;
    - extra user connection is establishing;
    - server checked user credentials, and sent 'Too many connections'
      error;
    - the client receives the error and establishes extra SUPER user
      connection;
    - the server however didn't decrease the counter (the extra
      user connection still is "alive" in the server) -- so, the new
      SUPER-user connection, will be dropped, because it exceeds
      (max_user_connections + 1).

The fix is to implement "safe connect", which makes several attempts
to connect and use it in the test script.

The problem was that 'connect' command didn't set mysql_errno
variable, thus the script was unable to determine whether connection
was opened or not.

The fix is to set this variable.

Test cases will be added in the scope of Bug33507
into connect.test file.

in some case.

ER_CON_COUNT_ERROR is defined with SQL state 08004. However, this SQL state is not always
returned.

This error can be thrown in two cases:

  1. when an ordinary user (a user w/o SUPER privilege) is connecting,
    and the number of active user connections is equal or greater than
    max_connections.

  2. when a user is connecting and the number of active user connections is
    already (max_connections + 1) -- that means that no more connections will
    be accepted regardless of the user credentials.

In the 1-st case, SQL state is correct.

The bug happens in the 2-nd case -- on UNIX the client gets 00000 SQL state, which is
absolutely wrong (00000 means "not error SQL state); on Windows
the client accidentally gets HY000 (which means "unknown SQL state).

The cause of the problem is that the server rejects extra connection
prior to read a packet with client capabilities. Thus, the server
does not know if the client supports SQL states or not (if the client
supports 4.1 protocol or not). So, the server supposes the worst and
does not send SQL state at all.

The difference in behavior on UNIX and Windows occurs because on Windows
CLI_MYSQL_REAL_CONNECT() invokes create_shared_memory(), which returns
an error (in default configuration, where shared memory is not configured).
Then, the client does not reset this error, so when the connection is
rejected, SQL state is HY000 (from the error from create_shared_memory()).

The bug appeared after test case for Bug#33507 -- before that, this behavior
just had not been tested.

The fix is to 1) reset the error after create_shared_memory();
2) set SQL state to 'unknown error' if it was not received from
the server.

A separate test case is not required, since the behavior is already
tested in connect.test.

Note for doc-team: the manual should be updated to say that under
some circumstances, 'Too many connections' has HY000 SQL state.

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

The problem is that since MyISAM's concurrent_insert is on by
default some concurrent SELECT statements might not see changes
made by INSERT statements in other connections, even if the
INSERT statement has returned.

The solution is to disable concurrent_insert so that INSERT
statements returns after the data is actually visible to other
statements.

into  quad.:/mnt/raid/alik/MySQL/devel/bug-35074/5.1-rt-bug35074

The problem was that number of threads was used to calculate
max_used_connections.

The fix is to use number of active connections.

than max_connections -- which results in user lockout.

The problem was that the variable thread_count that contains
the number of active threads was interpreted as a number of
active connections.

The fix is to introduce a new counter for active connections.

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt-merged

  
In cases when TRUNCATE was executed by invoking mysql_delete() rather
than by table recreation (for example, when TRUNCATE was issued on
InnoDB table with is referenced by foreign key) triggers were invoked.
In debug builds this also led to crash because of an assertion, which
assumes that some preliminary actions take place before trigger 
invocation, which doesn't happen in case of TRUNCATE.

The fix is not to execute triggers in mysql_delete() when this
function is used by TRUNCATE.

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

Disable test case for bug 29948, which is causing sporadically
failures in other tests inside mysql_client_test.

The initial value of free memory blocks in 0. When the query cache is enabled 
a new memory block gets allocated and is assigned number 1. The free memory
block is later split each time query cache memory is allocated for new blocks.
This means that the free memory block counter won't be reduced to zero when
the number of allocated blocks are zero, but rather one. To avoid confusion
this patch changes this behavior so that the free memory block counter is
reset to zero when the query cache is disabled.
Note that when the query cache is enabled and resized the free memory block
counter was still calculated correctly.

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

It's impossible to determine which test inside mysql_client_test
failed if the log file is overwritten by mysqltest when dumping
the test case results. Redirect mysql_client_test output to a
separate file.

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

READ_ONLY token was accidentally placed into wrong place
('ident' rule). The proper place is in the 'keyword_sp' rule.

The manual should be re-generated after this patch, because
the manual depends on the 'keyword_sp' rule.

into  buzz.(none):/home/davi/mysql-5.1-runtime

must match the order which they were declared in the class definition. 

Rename client_last_error to last_error and client_last_errno to last_errno
to not break connectors which use the internal net structure for error handling.

The problem is that passing anything other than a integer to a limit
clause in a prepared statement would fail. This limitation was introduced
to avoid replication problems (e.g: replicating the statement with a
string argument would cause a parse failure in the slave).

The solution is to convert arguments to the limit clause to a integer
value and use this converted value when persisting the query to the log.

sporadically.

(show_check.test fails sporadically).

Fix test case for Bug#12183 to make it stable.

into  mysql.com:/Users/davi/mysql/mysql-5.1-runtime

to reach the desired value.

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt-build

Disable the test case.

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt

into  quad.:/mnt/raid/alik/MySQL/devel/5.1-rt-merged